html,
body,
div,
section,
header,
footer,
aside,
article,
main,
nav,
ul,
ol,
li,
form
h1,h2,h3,h4,h5,h6,p {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
ol,
ul {
    list-style: none;
}
input ,
textarea {
    border: 1px solid #ccc;
    box-sizing: border-box;
    vertical-align: middle;
}
button {
    border: 1px solid #ccc;
    background-color: transparent;
    vertical-align: middle;
}
a {
    text-decoration: none;
    color: #333;
    -webkit-tap-highlight-color: transparent;
}

.fl {
    float: left;
}
.fr {
    float: right;
}
.clearfix::after {
    content: "";
    display: block;
    clear: both;
}

img {
    vertical-align: middle;
}
